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US 11,835,894 B2Granted
Image forming apparatus that changes discharge conveyance speed according to a distance between a sheet or image leading edge and a nip portion
AssigneeCanon Kabushiki Kaisha
InventorHajime Sugaya
Life of this patent
Estimating the term…
Abstract
An image forming apparatus includes a control unit configured to execute a sheet discharge mode. If a case where a distance between the leading edge and the nip portion is a first distance is a first case, and a case where a distance between the leading edge of the sheet and the nip portion is a second distance shorter than the first distance and the temperature detected by the temperature detection unit is the same as that in the first case is a second case, the control unit is configured to set a conveyance speed of the sheet in discharging the sheet toward the nip portion in the second case to be slower than that in the first case, in the sheet discharge mode.
Claims16
An image forming apparatus comprising:
- a conveyor that conveys a sheet and that includes a conveyance path through which the sheet is conveyed;
- an image forming unit, including at least one photosensitive drum, that forms an unfixed toner image on the sheet conveyed by the conveyor;
- a fixing unit, including a roller, that heats and pressurizes the sheet at a nip portion thereof to fix the toner image formed by the image forming unit to the sheet;
- a temperature detecting sensor that detects a temperature of the fixing unit;
- and
- a control unit, including a processor, configured to execute a sheet discharge mode of conveying and discharging the sheet to an outside of the apparatus in a state where the sheet is stopped on the conveyance path,
- wherein, in the sheet discharge mode where the sheet is stopped on the conveyance path, with a leading edge of the sheet positioned between the image forming unit and the nip portion:
- in a first state where the leading edge of the sheet and the nip portion are spaced at a first distance;
- and
- in a second state where:
- the leading edge of the sheet and the nip portion are spaced at a second distance, which is shorter than the first distance, and
- a detected temperature in the second state is the same as a detected temperature in the first state,
- the control unit is configured to change the discharge conveyance speed of the sheet in the sheet discharge mode according to the distance between the leading edge of the sheet to be discharged and the nip portion, by setting a slower discharge conveyance speed of the sheet in discharging the sheet toward the nip portion in the second state than that in the first state.
10 more elements
An image forming apparatus comprising:
- a conveyor that conveys a sheet and that includes a conveyance path through which the sheet is conveyed;
- an image forming unit, including at least one photosensitive drum, that forms an unfixed toner image on the sheet conveyed by the conveyor;
- a fixing unit, including a roller, that heats and pressurizes the sheet at a nip portion thereof to fix the toner image formed by the image forming unit to the sheet;
- a temperature detecting sensor that detects a temperature of the fixing unit;
- and
- a control unit, including a processor, configured to execute a sheet discharge mode of conveying and discharging the sheet to an outside of the apparatus in a state where the sheet is stopped on the conveyance path,
- wherein, in the sheet discharge mode where the sheet is stopped on the conveyance path, with a leading edge of the sheet positioned between the image forming unit and the nip portion:
- in a first state where the leading edge of the toner image formed on the sheet and the nip portion are spaced at a first distance;
- and
- in a second state where:
- the leading edge of the toner image formed on the sheet and the nip portion are spaced at a second distance, which is shorter than the first distance, and
- a detected temperature in the second state is the same as a detected temperature in the first state,
- the control unit is configured to change the discharge conveyance speed of the sheet in the sheet discharge mode according to the distance between the leading edge of the toner image formed on the sheet to be discharged and the nip portion, by setting a slower discharge conveyance speed of the sheet in discharging the sheet toward the nip portion in the second state than that in the first state.
10 more elements
An image forming apparatus comprising:
- a conveyor that conveys a sheet and that includes a conveyance path through which the sheet is conveyed;
- an image forming unit, including at least one photosensitive drum, that forms an unfixed toner image on the sheet conveyed by the conveyor;
- a fixing unit, including a roller, that heats and pressurizes the sheet at a nip portion thereof to fix the toner image formed by the image forming unit to the sheet;
- a temperature detecting sensor that detects a temperature of the fixing unit;
- and
- a control unit, including a processor, configured to execute a sheet discharge mode of conveying and discharging the sheet to an outside of the apparatus in a state where the sheet is stopped on the conveyance path,
- wherein, in the sheet discharge mode where the sheet is stopped on the conveyance path, with a leading edge of the sheet positioned between the image forming unit and the nip portion:
- in a first state where a distance between the nip portion and a region where an image coverage of the toner image formed on the sheet exceeds a first distance, and
- in a second state where the distance between the nip portion and the region where the image coverage of the toner image formed on the sheet exceeds a second distance, which is shorter than the first distance,
- the control unit is configured to change the discharge conveyance speed of the sheet in the sheet discharge mode according to the distance between the nip portion and the region of the sheet to be discharged, by setting a slower discharge conveyance speed of the sheet in discharging the sheet toward the nip portion in the second state than that in the first state.
7 more elements
Dependencies are inferred from the claim text.